Add cmake support

[Garcia6l20]

adds missing parts for MSVC support

• /await:heapelide for x64 target
• static tests-main library
• missing windows library dependencies

[Garcia6l20]

also includes remove CTest commit, so,

cmake -DBUILD_TESTING=ON <src_dir>

is now required to compile tests.

Tell me if you don't want it, I'll drop it.

[Garcia6l20]

• compiles successfully on MSVC 2019
• one test fails:

37 - async auto reset event tests-multi-threaded (SEGFAULT)

This is because were running into sack overflow (on x64 only with this particular number of event), see my comment in this commit.
We can workaround it but the whole implementation of cppcoro::static_thread_pool should be reviewed to avoid stack overflows.

[andreasbuhr]

Hi, thank you so much for your work.
Could you please remove the iostream includes for doctest? I'd like to take care of that problem in the "update_doctest" branch, see lewissbaker#178 . For your local testing, just merge the "update_doctest" branch.

[Garcia6l20]

Ok

[andreasbuhr]

Is there some documentation which versions of MSVC support the "/await:heapelide" flag? Are there old versions of MSVC which we could break by unconditionally setting the heapelide flag?
And do the new versions (16.8), which do not need the /await flag, need the heapelide flag?
I'd appreciate if we made sure we do not break anything by setting this flag.

[Garcia6l20]

I cannot find any documentation about this hidden version of the /await flag, all I know is that MSVC 2019 does not complain about it.

[andreasbuhr]

Can we maybe, instead of checking for CMAKE_CL_64 (which is discouraged, according to CMake documentation), check for the existence of this flag using check_cxx_compiler_flag? That way we'd make sure nothing bad happens if some version of MSVC does not know it.

[Garcia6l20]

I didn't know CMAKE_CL_64 was discouraged...
Yes it look like the better way to go

[Garcia6l20]

Hum, however the /await:heapelide is also ok for 32bit target.
Do you know why have been added for 64bit targets only ?

[Garcia6l20]

when using the heapelide version on 32bit, auto reset event test also runs into SEGFAULT.

[Garcia6l20]

no, sorry it's ok, I was targetting wrong processor

[Garcia6l20]

I just tested an fixed install target:

• change FindCppCoroCoroutine.cmake -> FindCoroutine.cmake
• windows doesn't know what is the '.' path

[andreasbuhr]

Thanks a lot for your effort, we tested with MSVC 2019 Preview 16.8.5, works great!